really feel like crap

yesterday I was fine until I ate some almonds.  twenty minutes after that I started having horrible stomach cramps.  I could not even eat last night.  today I have no idea if I am still sick with something or just having bad anxiety.  I hate the not knowing.  If i'm sick I obviously want to take care of myself but if it's just anxiety I need to suck it up and get through the day.  It is so frustrating.